If it's not what You are looking for type in the equation solver your own equation and let us solve it.
u in (-oo:+oo)
u/7.68+7 = 10 // - 10
u/7.68-10+7 = 0
0.13020833*u-3 = 0 // + 3
0.13020833*u = 3 // : 0.13020833
u = 3/0.13020833
u = 23.04000059
u = 23.04000059
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